Bioflotation of pyrite with Thiobacillus ferrooxidans  

作　　者：ShaoxianSong YiminZhang ShouciLu 

机构地区：[1]DepartmentofResourcesEngineering,WuhanUniversityofScienceandTechnology,Wuhan430081,China [2]CivilandEnvironmentalEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China

出　　处：《Journal of University of Science and Technology Beijing》2004年第5期385-388,共4页北京科技大学学报（英文版）

摘　　要：Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in thepresence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotationand electrophoretic light scattering measurements. The experimental results showed that in theabsence of xanthate, pyrite flotation is slightly enhanced by Thiobacillus ferrooxidans. However,with xanthate as a collector, pyrite flotation is strongly depressed after being exposed to thebacteria. The longer is the time when the pyrite is exposed to the bacteria, the stronger thedepression is. The mechanism of the depression might be due to the formation of the biofilms ofThiobacillus ferrooxidans on pyrite surfaces, preventing the adsorption of xanthate on pyritesurfaces in the form of dixanthogen or xanthate ions.Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in thepresence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotationand electrophoretic light scattering measurements. The experimental results showed that in theabsence of xanthate, pyrite flotation is slightly enhanced by Thiobacillus ferrooxidans. However,with xanthate as a collector, pyrite flotation is strongly depressed after being exposed to thebacteria. The longer is the time when the pyrite is exposed to the bacteria, the stronger thedepression is. The mechanism of the depression might be due to the formation of the biofilms ofThiobacillus ferrooxidans on pyrite surfaces, preventing the adsorption of xanthate on pyritesurfaces in the form of dixanthogen or xanthate ions.

关 键 词：BIOFLOTATION pyrite flotation Thiobacillus ferrooxidans zeta potential 

分 类 号：TD951.1[矿业工程—选矿] TD925.5